Abstract: To improve the wear resistance of component surfaces, the influence of surface roughness parameters—such as root mean square height, skewness, and kurtosis—on the wear performance of dynamic contact assembly interfaces is analyzed at the microscale. A numerical model of rough surface wear is first established, and the regulatory effects of root mean square height, skewness, and kurtosis on surface wear behavior are theoretically analyzed. The analysis shows that reducing the root mean square height increases the real contact area while decreasing both contact pressure and wear volume. Increasing kurtosis, although reducing the real contact area and raising local contact pressure, effectively lowers overall wear. Negative skewness helps expand the real contact area and reduce contact pressure, thereby further mitigating wear. Subsequently, experimental studies are conducted to investigate the effects of surface roughness parameters on dry sliding wear performance. The test results indicate that under dry friction conditions, surfaces with positive skewness and low kurtosis enter the stable wear stage more quickly but exhibit a higher wear rate. In contrast, surfaces with negative skewness and high kurtosis require a longer sliding distance to reach stability, yet demonstrate lower overall friction coefficients and reduced wear rates. These findings provide essential theoretical support and engineering guidance for optimizing surface treatment processes and enhancing wear resistance of components.

Key words: surface root mean square height, skewness, kurtosis, wear performance, assembly interfaces